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sheet molding compounds

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Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006945
EISBN: 978-1-62708-395-9
... polyethylene heat-de ection temperature high-impact polystyrene high-strength sheet molding compound high-performance liquid chromatography high-pressure polyethylene high-speed liquid chromatography International Electrotechnical Commission butyl rubber (or isobutylene-isoprene rubber) infrared; synthetic...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006935
EISBN: 978-1-62708-395-9
... for such processes as resin transfer molding and pultrusion, in which the resin must flow through preplaced glass reinforcements. For other processes, such as extra-high-strength molding compound and prepreg compression molding, the resin must be thickened by reaction to stay on the glass reinforcements. With sheet...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0090442
EISBN: 978-1-62708-218-1
... (butylene terephthalate) (PBT) resin. After molding, electronic components are inserted into the sleeves, and the assembly is filled with a potting compound. A retained lot of parts, which had not cracked, were available for reference purposes. Tests and Results The reference and failed parts were...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006864
EISBN: 978-1-62708-395-9
... guidelines, and special processes. It also covers the functions of the extruder, webline handling, mixing and compounding operations, and process troubleshooting. Thermoforming and mold design are covered. Various other technologies for polymer processing covered in this article are blow molding, rotational...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006925
EISBN: 978-1-62708-395-9
...(diallyl phthalate) DMC Dough molding compound (usually polyester) EC Ethyl cellulose EAA Ethylene-acrylic acid EEA Ethylene-ethyl acrylate EMA Ethylene-methacrylic acid EP Epoxy, epoxide EPD Ethylene-propylene-diene EPM Ethylene-propylene polymer ETFE Ethylene...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006916
EISBN: 978-1-62708-395-9
... of air removal; thus, vacuum level indicators (gauges or digital readouts) are necessary to ensure consistent batch to batch mixing and degassing. For composite applications, thermoset resins are impregnated into reinforcements such as random chopped fibers in bulk molding compounds (BMC) or sheet...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006927
EISBN: 978-1-62708-395-9
...), the relationship between the draw ratio and the sheet thickness will drive the design geometry for any given material to be formed. This tooling is single-sided, like rotational molding and blow molding, which allows detail to be sharp and precise on just one side of the part, with the other side following...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006928
EISBN: 978-1-62708-395-9
... thermoplastics D3419 10724 In-line screw-injection molding of test specimens from thermosetting compounds D3641 294-1,2,3 Injection molding test specimens of thermoplastic molding and extrusion materials D4703 293 Compression molding thermoplastic materials into test specimens, plaques, or sheets...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006913
EISBN: 978-1-62708-395-9
... with simple test electrodes. Specimens may be molded, cast, or cut from flat sheet or plate. The standard electrode configurations used for different dielectric strength tests of insulating materials are listed in Table 1 . Any of these widely used test methods developed and published by the ASTM...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006915
EISBN: 978-1-62708-395-9
.... The polymer chains can also be aligned parallel and perpendicular (transverse) to the primary direction of flow, as shown in Fig. 5(d) . Blown-film extrusion and blow molding inherently produce this biaxial orientation. In the production of polyethylene terephthalate (PET) sheet, uniaxial orientation occurs...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.9781627083959
EISBN: 978-1-62708-395-9
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006923
EISBN: 978-1-62708-395-9
.... Any T m given is for remaining crystalline portion or for crystalline version. (b) Degradation temperature ( T d ) = 500 °C (930 °F). R contains at least one aromatic ring. (c) Based on private communication, American Cyanamid Co. Source: Ref 1 – 3 and product information sheets...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003525
EISBN: 978-1-62708-180-1
... formulation constituents, FTIR is extremely useful in the determination of contaminant materials within the failed part material. While contamination is never an intended part of a plastic compound, its presence certainly can have a tremendous impact on the properties of the molded component. Through...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006868
EISBN: 978-1-62708-395-9
... molds are most often granulated and reused in the feed stream to the injection unit. Scrap from die-cut sheet forms, such as food storage bags, or thermoformed thin gauge articles, such as coffee cup tops, are again salvaged in-line and routed to granulators to be prepared for reintroduction in the feed...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006849
EISBN: 978-1-62708-395-9
... or three laboratories, each molding and testing specimens from the same production lot of resin/compound. If there were a concern regarding repeatability of a test result, the participants can share their molded specimens and laboratory data to identify any source of inconsistency including mold design...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006933
EISBN: 978-1-62708-395-9
... a significant detrimental impact on the mechanical and physical properties of a plastic material. This degradation can result from several stages in the material life, including resin compounding, molding, and service. As a polymeric material is degraded on a molecular level, the bonds comprising the material...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006917
EISBN: 978-1-62708-395-9
... and of the complexities involved in being able to properly characterize it. Plastics production uses a recipe of numerous compounds that make up the final product. The base material is the polymer, essentially many long molecules tightly entangled together to form a viscoelastic structure. Polymer molecules...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003507
EISBN: 978-1-62708-180-1
.... The article provides a discussion on the imperfections found in steel forgings. The problems encountered in sheet metal forming are also discussed. The article concludes with information on the causes of failure in cold formed parts. anisotropy blisters centerline shrinkage chemical segregation cold...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006939
EISBN: 978-1-62708-395-9
... due to poor thermal-oxidative stability ( Ref 1 ). The use of additives in thermosetting polymers is equally important. One of the oldest thermosets, Bakelite, exhibits high cure shrinkage, which leads to cracks in the mold material ( Ref 2 ). Suitable filler additives reduce the cure shrinkage...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006942
EISBN: 978-1-62708-395-9
... of curves shown in Fig. 1 . Early in the product life, the number of failures may be elevated. These failures are often attributed to manufacturing and/or quality control errors, such as a deficient molding procedures, improper assembly techniques, or material defects. As the design matures, these errors...